using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using Tango.Core.Helpers;
using Tango.BL.Entities;
using Tango.Logging;
using Tango.MachineStudio.UI.Windows;
using Tango.Settings;
using Tango.MachineStudio.Common.EventLogging;
using Tango.BL.Enumerations;
using Tango.Core.DI;
using Tango.MachineStudio.UI.TFS;
using Tango.TFS;
using Tango.MachineStudio.Common.Notifications;
using Tango.MachineStudio.UI.ViewModels;
using Tango.MachineStudio.UI.Views;
using Tango.MachineStudio.Common;
using Tango.Core;
using Tango.BL;
using Tango.Integration.Operation;
using System.Net;
using System.Globalization;
using System.Windows.Markup;

namespace Tango.MachineStudio.UI
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        private WpfGlobalExceptionTrapper exceptionTrapper;
        private LogManager LogManager = LogManager.Default;

        public static String[] StartupArgs { get; set; } = Environment.GetCommandLineArgs().Skip(1).ToArray();

        protected override void OnStartup(StartupEventArgs e)
        {
            //Set culture info.
            var enUSCulture = new CultureInfo("en-US");

            Thread.CurrentThread.CurrentCulture = enUSCulture;
            Thread.CurrentThread.CurrentUICulture = enUSCulture;
            CultureInfo.DefaultThreadCurrentCulture = enUSCulture;
            CultureInfo.DefaultThreadCurrentUICulture = enUSCulture;

            FrameworkElement.LanguageProperty.OverrideMetadata(
            typeof(FrameworkElement),
            new FrameworkPropertyMetadata(XmlLanguage.GetLanguage(CultureInfo.CurrentCulture.IetfLanguageTag)));

            StartupArgs = e.Args;

#if DEBUG
            CoreSettings.DefaultDataSource = new DataSource()
            {
                Address = "localhost\\SQLEXPRESS",
                Catalog = "Tango",
                IntegratedSecurity = true,
            };
#else

            CoreSettings.DefaultDataSource = new DataSource()
            {
                Address = "twine01\\SQLTWINE",
                Catalog = "Tango",
                IntegratedSecurity = true,
            };
#endif


#if DEBUG
            LogManager.RegisterLogger(new VSOutputLogger());
#endif
            LogManager.RegisterLogger(new FileLogger() { EnableAutoLogRemoval = true, EnableMaxFileSizeLimit = true });

            var operatorLogger = MachineOperator.EmbeddedLogManager.RegisteredLoggers.SingleOrDefault(x => x is FileLogger) as FileLogger;
            if (operatorLogger != null)
            {
                operatorLogger.EnableAutoLogRemoval = true;
                operatorLogger.EnableMaxFileSizeLimit = true;
            }

            LogManager.Log("Application Started...");

            LogManager.LogReferencedAssemblies();
            var settings = SettingsManager.Default.GetOrCreate<MachineStudioSettings>();
            //add current theme
            MachineStudioTheme wTheme = settings.Theme;

            try
            {
                Z.EntityFramework.Extensions.LicenseManager.AddLicense("4578;101-twine-s.com", "9d23b66f-1101-b253-7f8a-59ae011b2ee8");

                string licenseErrorMessage;
                if (!Z.EntityFramework.Extensions.LicenseManager.ValidateLicense(out licenseErrorMessage))
                {
                    throw new Exception(licenseErrorMessage);
                }
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error performing EF extensions license setup.");
            }

            base.OnStartup(e);

            exceptionTrapper = new WpfGlobalExceptionTrapper();
            exceptionTrapper.Initialize(this);
            exceptionTrapper.ApplicationCrashed += ExceptionTrapper_ApplicationCrashed;

            ApplyEFCacheSettings();

            WebRequest.DefaultWebProxy = null;

            GetLastApplicationCrashFromWindows();
        }

        private async void GetLastApplicationCrashFromWindows()
        {
            var logItem = await exceptionTrapper.GetLastApplicationCrashEventLog();
            if (logItem != null)
            {
                LogManager.Log(logItem);
            }
        }

        private void ApplyEFCacheSettings()
        {
            var settings = SettingsManager.Default.GetOrCreate<MachineStudioSettings>();

            if (settings.CachingMode != ObservablesContextInMemoryCachingMode.None)
            {
                LogManager.Log("EF Caching is enabled.");
                LogManager.Log($"EF Caching mode is: {settings.CachingMode}.");
                LogManager.Log($"EF Caching timeout: {settings.MaximumCacheTime.ToString()}");
                try
                {
                    ObservablesContext.EnableInMemoryCache(settings.MaximumCacheTime, settings.CachingMode);
                }
                catch (Exception ex)
                {
                    LogManager.Log(ex, "Error while trying to activate EF caching.");
                }
            }
            else
            {
                LogManager.Log("EF Caching is disabled");
            }
        }

        #region Global Exception Trapping

        /// <summary>
        /// Handles the ApplicationCrashed event of the ExceptionTrapper.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="ApplicationCrashedEventArgs"/> instance containing the event data.</param>
        private void ExceptionTrapper_ApplicationCrashed(object sender, ApplicationCrashedEventArgs e)
        {
            try
            {
                try
                {
                    if (Application.Current == null)
                    {
                        new Application { ShutdownMode = ShutdownMode.OnExplicitShutdown };
                    }
                }
                catch { }

                if (e.Exception.ToString().Contains("A Task's exception(s) were not observed"))
                {
                    e.TryRecover = true;
                    LogManager.Log("Task not observed exception. Ignoring...");
                    return;
                }

                Application.Current.Dispatcher.Invoke(() =>
                {
                    WorkItem bug = null;
                    TeamFoundationServiceExtendedClient tfsClient = null;
                    INotificationProvider notification = null;

                    try
                    {
                        tfsClient = TangoIOC.Default.GetInstance<TeamFoundationServiceExtendedClient>();
                        notification = TangoIOC.Default.GetInstance<INotificationProvider>();

                        if (tfsClient != null && tfsClient.IsInitialized)
                        {
                            bug = tfsClient.CreateBug();
                        }
                    }
                    catch (Exception ex)
                    {
                        Debug.WriteLine(ex.ToString());
                    }

                    ExceptionWindow exWin = new ExceptionWindow(e.Exception, bug != null);
                    exWin.ShowDialog();

                    switch (exWin.Resolution)
                    {
                        case ExceptionResolutions.Ignore:
                            e.TryRecover = true;
                            break;
                        case ExceptionResolutions.Restart:
                            e.TryRecover = false;
                            LogManager.Log("User selection was to restart the application. Restarting...");
                            Process.Start(Application.ResourceAssembly.Location);
                            Environment.Exit(0);
                            break;
                        case ExceptionResolutions.Shutdown:
                            e.TryRecover = false;
                            LogManager.Log("User selection was to shutdown the application. Restarting...");
                            Environment.Exit(0);
                            break;
                        case ExceptionResolutions.Report:
                            e.TryRecover = true;
                            LogManager.Log("User selection was to report the issue.");

                            if (bug != null)
                            {
                                notification.ShowModalDialog<ReportIssueViewVM, ReportIssueView>(new ReportIssueViewVM(tfsClient.Project, bug), async (vm) =>
                                {
                                    using (notification.PushTaskItem("Uploading bug report..."))
                                    {
                                        try
                                        {
                                            tfsClient.FinalizeBug(vm.WorkItem);
                                            await tfsClient.UploadWorkItem(vm.WorkItem);
                                        }
                                        catch (Exception ex)
                                        {
                                            notification.ShowError("An error occurred while trying to create the issue." + Environment.NewLine + ex.Message);
                                        }
                                    }

                                }, null);
                            }

                            break;
                    }
                });
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error in global exception trapper!");
                MessageBox.Show(ex.ToStringSafe());
            }
        }

        #endregion
    }
}